Keyhole attachment for locks.



D. P. MAHON.

KEYHOLE ATTACHMENT FOR LOCKS.

APPLICATION FILED NOV. 14. l9l6.

Patented Feb. 27, 1917.

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UNITED STATES PATENT oFFIo DANIEL r. MAHON, or QUINCY, MASSACHUSETTS.

Specification of Letters Patent.

Patented'Feb. 27,1917.

- Application filed November 14;, 1915. Serial No. 131,229.

To all whom it may concern:

Be it known that I, DANIEL P. MAHON, a citizen of the United States,residing at Quincy, in the county of Norfolk and State of Massachusetts,have invented certain new and useful Improvements in Keyhole Attachmentsfor Locks; and I do hereby declare .the following to be a full, clear,and

exact description of the invention, such as will enable others skilledin the art to which it appertains to make and use'the same.

.This invention relates to a key-hole attachment for locks and has forits primary object the provision of means for guiding a key into thekey-hole of a lock, thus -obviating the annoyance of feeling for akeyhole in the dark or like time.

Another object of ,this invention is'to provide a frustro-oonical shapedplate positioned over the key-hole of a lock and having a centralkey-hole slot therein, whereby upon inserting the key into thefrustro-conical shaped plate, the key will be guided into the key-holeof the lock.

' A further object of this invention'js to provide a tongue formed onthe lower wall of the key-hole slot of the plate and extending into anengagement with the lower wall of the keyhole of a lock to guide the keytherein without the key engaging or catching upon the lower wallthereof.

A still further object of this invention is the provision of a key-holeattachment for looks of the above stated character, which shall besimple, durable and eflicient, and which may be manufactured and Sold ata comparatively low cost.

With these and other objects in view as will become more apparent as thedescription proceeds, the invention consists in certain novel featuresof construction, combination and arrangement of parts, as will behereinafter more fully described and claimed.

For a complete understanding of my invention, reference will be had tothe following descriptionan'd accompanying drawings, in which holeattachment for looks constructed in accordance with my invention,

Fig. 2 is a vertical sectional view of the same,

Fig. 3 is a transverse Sectional view taken on the line 3-3 of Fig. 1.

Referring in detail to the drawing, the numeral 1 indicates a frontplate of a door lock which is secured to a door- 2, by means of screwsor other like fasteners 3 and which plate is provided with akey-holeslot 4, for

allowing a key to beinserted within the lock of the door and over whichmy invention is applied.

frusto-conical shaped guide plate 5 is provided with a central key-holeslot 6, which is placed in alinement with the keyhole slot- 4 of theplate 1. The guide plate 5 has oppositely disposed and downwardlydepending legs 6 formed thereon which have their lower ends bent atright angles to form attaching feet 7 that are riveted or other-- wiseSecured to the plate 1. A tongue 8 is formed upon the lower wall of thekey-hole slot 6 of the guide plate 5 and engages the lower wall of thekey-hole slot 4 of the plate 1, so that upon an insertion of a key intotheconical shaped guide plate 5, it will be guided through thekey-holeslot 6 and into the key-hole slot 4 of the plate 1 without engaging thelower wall of the key-hole slot 4 of the plate 1, as the tongue 8 guidesthe key over the lower wall thereof and prevents the key from engagingor catching the lower'wall, thus establishingan efficient. andcornpleted guide for a key into the lock of a oor.

From the foregoing description in connection with the accompanyingdrawing, it will be noted that uponshoving or pushing a key against thewall of the guide plate, it will be ided throughthe key-hole slot 6therein, into the lock of the door by way of the key-hole slot 4 in theplate and also will be prevented from catching or engaging the bottomwall of the Slot 4 by the tongue 8.

While I have shown and described the preferred embodiment of myinvention, it will be understood that minor changes in construction,combination and arrangement of parts may be made Without departing fromthe spirit and scope of the invention as claimed. V v

Having thus described my invention, what I claim is:

In combination with a lock including a key-hole slot, of afrusto-conical shaped guide plate secured to the lock and having acentral key-hole slot in registration With the key-hole slot of thelock. and a tongue

